Dataforth SCM9B-D192 Series Panduan Pengguna - Halaman 3

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3 SCM9B-D192 USERS MANUAL

GENERAL DESCRIPTION

The RS-485 communications standard is recommended when many

modules, or other addressable devices, must be connected to a host

computer over long distances. The SCM9B-D192 repeaters allow

communications bus lengths up to 4,000 feet and baud rates up to

115K baud using one twisted pair of wires. The SCM9B-D192 is an RS-

485 repeater. Repeaters are required to extend communications bus

lengths or allow more than 32 RS-485 devices to be connected to a

communications bus. A repeater simply re-amplifies, or boosts, existing

RS-485 signals transmitted over long distances.

The SCM9B-D192 is isolated between input and output ports and

requires a regulated +5Vdc power supply.